MREIT with SENSE acceleration using a dedicated RF coil design.
MREIT with SENSE acceleration using a dedicated RF coil design.
复制标题
MREIT 采用专用射频线圈设计，具有 SENSE 加速功能。
DOI：
10.1088/0967-3334/30/9/004
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发表时间：
2009
影响因子：
3.2
通讯作者：
Ha,SeungHoon
中科院分区：
文献类型：
--
作者：
Muftuler,LTugan;Chen,Gang;Hamamura,MarkJ;Ha,SeungHoon
我们已经适应了磁共振电阻抗断层扫描（MREIT）的SENSE加速成像技术，以更快地采集数据或提高空间分辨率，而不增加数据采集时间。我们还为此应用设计并优化了八通道专用相控阵线圈。RF线圈被设计为两个平面阵列，使得开口侧可以容纳MREIT电极。准固有去耦方案用于最小化线圈元件之间的耦合，并且应用受限几何优化以在给定线圈几何形状和动物尺寸内实现高且均匀的SNR。在优化中还研究了动物体型变异性的影响。与为小动物MREIT设计的发射/接收鸟笼线圈相比，该线圈几何结构在体模中心提供了约3倍的SNR。因此，即使在三倍SENSE加速的情况下，SNR仍优于使用容积线圈采集的数据。上级。在有和没有SENSE加速度的情况下，从体模中获取幅度图像和MREIT数据，并对结果进行比较。体模研究表明，电导率标测图可以从使用三倍SENSE加速采集的MREIT数据中重建，并且当将加速数据采集与非加速数据进行比较时，未观察到可辨别的伪影。
We have adapted a SENSE-accelerated imaging technique to magnetic resonance electrical impedance tomography (MREIT) in order to acquire data faster or improve spatial resolution without increasing the data acquisition time. We also designed and optimized an eight-channel, dedicated phased array coil for this application. The RF coil was designed as two planar arrays so that the open sides could accommodate the MREIT electrodes. A quasi-intrinsic decoupling scheme was used to minimize couplings between coil elements, and a restricted geometry optimization was applied to achieve high and uniform SNR within a given coil geometry and animal size. The impact of variability in the size of animals was also investigated in the optimization. This coil geometry provided approximately three times higher SNR at the center of a phantom when compared to a transmit/receive birdcage coil designed for MREIT of small animals. Therefore, the SNR was superior to the data acquired with volume coils even with three times SENSE acceleration. Both magnitude images and MREIT data were acquired from phantoms with and without SENSE acceleration, and the results were compared. The phantom studies demonstrated that conductivity maps can be reconstructed from MREIT data acquired with three times SENSE acceleration and that no discernible artifacts were observed when accelerated data acquisition was compared to non-accelerated data.